The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/endian.h

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    1 /*
    2  * Copyright (c) 1987, 1991 Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      from: @(#)endian.h      7.8 (Berkeley) 4/3/91
   34  * $FreeBSD: stable/4/sys/i386/include/endian.h 55205 1999-12-29 04:46:21Z peter $
   35  */
   36 
   37 #ifndef _MACHINE_ENDIAN_H_
   38 #define _MACHINE_ENDIAN_H_
   39 
   40 /*
   41  * Define the order of 32-bit words in 64-bit words.
   42  */
   43 #define _QUAD_HIGHWORD 1
   44 #define _QUAD_LOWWORD 0
   45 
   46 #ifndef _POSIX_SOURCE
   47 
   48 /*
   49  * Definitions for byte order, according to byte significance from low
   50  * address to high.
   51  */
   52 #define LITTLE_ENDIAN   1234    /* LSB first: i386, vax */
   53 #define BIG_ENDIAN      4321    /* MSB first: 68000, ibm, net */
   54 #define PDP_ENDIAN      3412    /* LSB first in word, MSW first in long */
   55 
   56 #define BYTE_ORDER      LITTLE_ENDIAN
   57 
   58 #ifndef _KERNEL
   59 #include <sys/cdefs.h>
   60 #endif
   61 
   62 __BEGIN_DECLS
   63 unsigned long   htonl __P((unsigned long));
   64 unsigned short  htons __P((unsigned short));
   65 unsigned long   ntohl __P((unsigned long));
   66 unsigned short  ntohs __P((unsigned short));
   67 __END_DECLS
   68 
   69 #define __word_swap_long(x) \
   70 __extension__ ({ register u_long __X = (x); \
   71    __asm ("rorl $16, %1" \
   72         : "=r" (__X) \
   73         : "" (__X)); \
   74    __X; })
   75 
   76 #if defined(_KERNEL) && (defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)) && !defined(I386_CPU)
   77 
   78 #define __byte_swap_long(x) \
   79 __extension__ ({ register u_long __X = (x); \
   80    __asm ("bswap %0" \
   81         : "=r" (__X) \
   82         : "" (__X)); \
   83    __X; })
   84 #else
   85 
   86 #define __byte_swap_long(x) \
   87 __extension__ ({ register u_long __X = (x); \
   88    __asm ("xchgb %h1, %b1\n\trorl $16, %1\n\txchgb %h1, %b1" \
   89         : "=q" (__X) \
   90         : "" (__X)); \
   91    __X; })
   92 #endif
   93 
   94 #define __byte_swap_word(x) \
   95 __extension__ ({ register u_short __X = (x); \
   96    __asm ("xchgb %h1, %b1" \
   97         : "=q" (__X) \
   98         : "" (__X)); \
   99    __X; })
  100 
  101 /*
  102  * Macros for network/external number representation conversion.
  103  */
  104 #ifdef __GNUC__
  105 #define ntohl   __byte_swap_long
  106 #define ntohs   __byte_swap_word
  107 #define htonl   __byte_swap_long
  108 #define htons   __byte_swap_word
  109 #endif
  110 
  111 #define NTOHL(x)        ((x) = ntohl((u_long)(x)))
  112 #define NTOHS(x)        ((x) = ntohs((u_short)(x)))
  113 #define HTONL(x)        ((x) = htonl((u_long)(x)))
  114 #define HTONS(x)        ((x) = htons((u_short)(x)))
  115 
  116 #endif /* ! _POSIX_SOURCE */
  117 
  118 #endif /* !_MACHINE_ENDIAN_H_ */

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